Research Lead-zinc Sulfide Ore Low Alkali Separation

ASichuan lead-zinc ore had complex components, lead and zinc minerals existed differentdegree of oxidation, and had nonuniformity granularity, it made the forth flotation separation oflead and zinc minerals become difficult. The thesis aimed to find out a new agent which hasstrong collecting ability and good selectivity for lead minerals under low alkalinity conditions,and achieve the separation of sulfide lead-zinc ore under low alkalinity conditions.According to the single mineral test, practical ore flotation test, infrared spectroscopy test,ultraviolet spectrum test, the thesis mainly studied the minerals forth flotation separation andthe mechanism of the reagent.The single mineral test study showed that the three reagents’galena collecting ability orderwas ethyl xanthate>ethyl thio carbamate>QF-11, the selectivity order was QF-11>ethyl thiocarbamate>ehyl xanthate. The practical ore flotation test study showed that use QF-11as leadcollector, CuSO4as zinc activator and ethyl xanthate as zinc collector, the lead mineralprocessing system was once first concentration, triple concentration and once scavenging, thezinc mineral processing stytem was once first concentration, triple concentration and twicescavenging, with the process utilized in this work, when the ore containing1.94%Pb,2.77%Zn and160g/t Ag, a lead concentrate of60.67%Pb with a recovery of88.03%, containingsilver4668.35g/t, silver recovery rate of82.13%, and a zinc concentrate of51.87%Zn with arecovery of89.65%were produced. The lead minerals were successfully separated from thezinc minerals under low alkalinity conditions. Compared to ehyl thio carbamate high alkalinityproject, the lead grade in the lead concentration of the QF-11project was lower, but the leadrecovery was higher, and the silver recovery rate in the lead concentration was improvedobviously. The infrared spectroscopy test study showed that the QF-11was strong adsorption onthe galena surface, however, the QF-11was not very obvious adsorption on the sphaleritesurface, and the reagent was adsorbed on the galena surface by C=S bond and C=O bond.Ultraviolet spectrum test results showed that the amount of the QF-11adsorbed on the surfaceof the galena was greater than the amount adsorbed on the surface of the sphalerite.From the test date, the infrared spectroscopy tese, ultraviolet spectrum test, we can get thatthe reagent QF-11has strong collecting ability and good selectivity for the lead minerals underlow alkalinity, we can achieve the successfully separation of lead-zinc ore under low alkalinityconditions and easiler reagent regime, the associated silver’s recovery is high, it offers a newproject for lead-zinc ore separation.